<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>后盾人</title>
    <style>
        * {
            padding: 0;
            margin: 0;
        }

        body {
            padding-top: 50px;
        }

        article {
            margin: 0 auto;
            width: 300px;
            height: 300px;
            border: solid 5px silver;
            display: grid;
            grid-template-rows: [r1-start] 100px [r1-end r2-start] 100px [r2-end r3-start]100px[r3-end];
            grid-template-columns: [c1-start] 100px [c1-end c2-start] 100px [c2-end c3-start]100px[c3-end];
        }

        div {
            background: blueviolet;
            background-clip: content-box;
            border: solid 1px blueviolet;
            padding: 10px;
            box-sizing: border-box;
            color: white;
            font-size: 25px;
        }

        div:first-child {
            grid-row-start: r2-start;
            grid-column-start: c2-start;
            grid-column-end: c3-start;
            grid-row-end: r3-start;
        }
    </style>
</head>

<body>
    <article>
        <div></div>
    </article>
</body>

</html>